1. First Black Coin
To get the first Black Coin, snatch the key that’s resting on top of a trio of Dash Back buttons. Then bounce back to jump on the Boo that will be flying from the left. After that, enter the green door in the middle.
2. Second Black Coin
The second Black Coin is located in the middle. Just climb up to get the second Black Coin.
3. Third Black Coin
As you make your way up, bounce back against the right platform with bars and then jump on the Boo flying from the left.
After that, get the key from the platform on the left and then enter the Green Door in the middle.
4. Fourth Black Coin
To get the fourth Black Coin, upon exiting the Green Door, move through the right most area of the stage and then exit at the left to get the coin.
5. Fifth Black Coin
To get the fifth Black coin, step on the Pause button that’s in the middle of the Green door at the bottom then hop on the two bricks nearby and then bounce back from the edge of the platform with Forward Dash buttons in order to get the Fifth Black Coin.
Get the key by latching onto the two-brick platform above with a key on top of it.